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From HalfLife 2 Knowledge Base

by Zpanzer
In this tutorial i will show how to make an rotating fan in some easy steps. Its pretty simply using 1 entity and one brush based entity.
1. first of all build your room or whatever you want the fan in.

2. After that make an prop_dynamic and give it the model of your fan(props/de_prodigy/fan.mdl), get the propeties and edit:
Name: fan01
Parent: rot01 (we make this shortly)
Save the propeties.

3. Then make an brush with the texture of toolsorigin (edit if you can use others) in the middle of the models and then press tie to entity and make it an Func_rotating and edit:
Name: rot01
And then your done, compile the map and you will se an rotating fan where you placed it.
Hope you enjoy the tutorial.